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TM Filtz, Q Li, JL Boyer, RA Nicholas and TK Harden
Department of Pharmacology, University of North Carolina School of Medicine, Chapel Hill 27599.
P2Y purinergic receptors previously have been shown to couple either to activation of phospholipase C through a pertussis toxin-insensitive mechanism or to inhibition of adenylyl cyclase through pertussis toxin- sensitive members of the G1 family of G proteins. These and other pharmacological data strongly suggest that multiple P2Y purinergic receptors exist. Webb et al. [FEBS Lett. 324:219-225 (1993)] cloned a cDNA that, when expressed in frog oocytes, displayed the general pharmacological characteristics of a P2Y purinergic receptor but whose second messenger linkage was not resolved. We have now cloned the meleagrid (turkey) homologue of the previously cloned chick P2Y purinergic receptor and have stably expressed it in a heterologous human cell line (1321N1 astrocytoma cells) to establish its signaling properties. The purinergic receptor agonist 2-methylthio-ATP (2MeSATP) stimulated a marked activation of phospholipase C in 1321N1 cells stably expressing the meleagrid receptor. The order of potency of a series of analogues of ATP and ADP for stimulation of phospholipase C by the receptor expressed in 1321N1 cells [2MeSATP = 2-methylthio-ADP > adenosine 5'-O-(2-thio)diphosphate > ADP > 2-chloro-ATP = adenosine 5'- O-(3-thio)triphosphate > or = ATP > adenylyl-imidodiphosphate > UTP] was similar to that observed for P2Y purinergic receptors in turkey erythrocytes and many other tissues and was markedly different from those of the P2U and P2X purinergic receptor subtypes. Stimulation of inositol lipid hydrolysis by P2Y purinergic agonists was not affected by preincubation of cells with pertussis toxin. In contrast to its marked effects on phospholipase C activity, 2MeSATP caused only a small and variable inhibition of cAMP accumulation. Ribonuclease protection analysis of turkey tissues showed that this P2Y purinergic receptor is most highly expressed in blood and brain. Taken together, these results indicate that a phospholipase-C-activating P2Y purinergic receptor has been cloned and stably expressed in 1321N1 astrocytoma cells.
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